certainty of origin : Donated directly by the Author.
author(s) : Amstutz, Ramdohr and De Las Casas
date of publication : 1957
source : Boletin Sociedad Geologia del Peru (32) p.25-33
formula : PbAs4S7 (?)
comments about the origin : etiquette Univ. Heidelberg, Amstutz 1975
This type specimen, kept in the Museum of Ecole des mines de Paris, has been indexed by Dr Guillemin.
(C) BRGM, ENSMP